Stopper for plastic or glass tubes for use in taking, transportation and preserving bacteriological samples



FIG. 1 is a rear perspective view of the stopper for plastic or glass tubes for use in taking, transportation and preserving bacteriological samples showing our new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a side elevational view of the stopper with portion thereof fragmentarily broken away; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a stopper for plastic or glass tubes for use in taking, transportation and preserving bacteriological samples, as shown. 